Tradecraft
What is Counterintelligence?
Activities to detect and defeat an adversary's intelligence efforts against you, from spotting surveillance to finding insiders.
Counterintelligence covers the activities that identify, deceive and disrupt an adversary's intelligence collection. In government it means catching spies and protecting secrets. In cyber it includes detecting reconnaissance against the organisation, protecting the identities of researchers, spotting infiltration of communities and feeding deception to attackers.
A key insight is that the adversary is also collecting. Assuming you are being watched changes how you handle sources, research accounts and sensitive findings.